n.
 
1.  The act or process of radiating: the radiation of heat and light from a fire.
2.  Physics 
a.  Emission and propagation and emission of energy in the form of rays or waves.
b.  Energy radiated or transmitted as rays, waves, in the form of particles.
c.  A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
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